HLH	Hemophagocytic lymphohistiocytosis
CXCL	C-X-C motif chemokine ligand
NK	Natural killer
MAS	Macrophage activation syndrome
CAR	Chimeric antigen receptor
IFN	Interferon
CXCR	C-X-C motif chemokine receptor
AST	Aspartate aminotransferase
EULAR	European Alliance of Associations for Rheumatology
ACR	American College of Rheumatology
EBV	Epstein–Barr virus
IQR	Interquartile range
pg	Picogram
mL	Milliliter
CNS	Central nervous system
CSF	Cerebrospinal fluid
ONID	Other neuroinflammatory disorders
ng	Nanogram
AUC	Area under the curve
SEBVTCL	Systemic Epstein–Barr virus-positive T-cell lymphoma of childhood
CAEBV	Chronic active Epstein–Barr virus disease
TCR	T-cell receptor
WHO	World Health Organization
NACHO	North American Consortium for Histiocytosis
HR	Hazard ratio
CI	Confidence interval
RED	Ruxolitinib, emapalumab, dexamethasone
CRP	C-reactive protein
ELISA	Enzyme-linked immunosorbent assay
FDA	Food and Drug Administration
GVHD	Graft-versus-host disease
IEC-HS	Immune effector cell-associated HLH-like syndrome
CRS	Cytokine release syndrome
ICANS	Immune effector cell-associated neurotoxicity syndrome
ASTCT	American Society for Transplantation and Cellular Therapy